import numpy as np
from scipy.constants import *

femto = 1e-15
micron = 1e-6
qe = e
me = m_e
epsilon0 = epsilon_0
#======================================
v_ph = 299792458.0
wavelength = 1e-6
frequency = c / wavelength * 2 * pi
wavevector = [2 * np.pi / wavelength, 0, 0]
wavenumber = 1.0 / wavelength
period = wavelength / v_ph

a = 0.06  #e21
E = a * me * frequency * v_ph / qe
laser_itst = E**2 * v_ph * epsilon0 / 2.0e4